'74 CB750F Cafe... My First Ever Build


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So, I have been wanting to get into bikes for a long time, but never had the chance. I am FINALLY in a position to where i can. Motorcycles and mechanics runs in my blood and im ready to feel the rush! After thinking long and hard about what i wanted, I have decided to go cafe :D I want to learn bikes from the ground up and this will be the best way to do it. I will be learning the whole way, creating something that looks mean, and displaying my standards in craftsmanship. Like i said, i am a total noob to customizing motorcycles and want to make an in depth build forum for all the others that dont have all the well qualified people around them to give them advice along the way. For all you veterans, please bear with me and give advice or ask questions whenever you feel like it. I can use all the help i can get :)

I will be starting with a '74 Honda CB750.

It turns out that the bike has a minor problem :'(

This is where the chain popped and broke a hole in the case :( Yet, it is ok. We have a donor ;D It is a '70 CB750.

I am not sure what the person was trying to do to this thing, but the chopper idea they were taking to it looks like crap. All I need is the motor :)
I am putting the motor aside for now and focusing on the project ahead. So, I stripped the bike down to frame.

SO, after fighting with a compressor that is waaaaaaayyyyy past its prime, I decided to take the frame to my brother's. I had 2 days off, which hardly ever happens, and wanted to get some work done. Since this is my first build, my brother is giving a lot of pointers. While i was there, I helped him get his cb450 cafe out of storage and back to the house. We have very similar tasts, and i am getting a lot of ideas from his bike. I thought you should all see it.

I am about done prepping the frame. Will post pics when finished.
Your Brothers CB is absoultely stunning, I cannot wait to see yours when finished it should look even better because you have your ideas and your Brothers.
So, when prepping the frame for powder coating, i had to decide what i wanted to keep and what i didnt. I like the stripped look, so i was very generous with what i cut off. I am not using the factory air box or the side cover. I used a reciprical saw and cutting disks to cut the tabs, and a hand file to smooth the frame surface.

I then decided i did not want the factory oil reserve or the seat pin brackets. So i did the same to those tabs and the other air box tab.

If you have not noticed already i also cut the tail section just after the rear shocks supports. I also decided to get rid of the center stand. so... off it came.

I have also decided to not use rear sets that bolt directly to the back foot peg brackets. So, Bye bye.

Now, before i can take the frame to the frabricator, I have to decide what rear sets i want to use. I am thinking of using rear sets off a newer age honda, like an f4i or cbr. If anyone has any recomendations here or rear sets for sale, let me know.
willing to sell some parts from that part bike?
what do the gauges and top triple look like?
I am willing to sell anything off the donor bike, including engine internals, cylinders, heads, cams, etc.

The gauges have seen better days.

The upper and lower triples should clean up nice though.

Awesome build documentation so far man (PLEASE DON'T STOP!!!) I'm getting a lot of knowledge from your pics and descriptions, as I'm about to start my own first build in the next month or so (I have experience with honda CARS, but not bikes). Keep up the good work!

Thank you for your interest in my project ;D . It is nice to see others getting ideas from my thread. I have been moving fairly slow due to some money issues that i have run into. Yet, it is getting there. Considering the money issue, i have decided to tear apart the engines to verify that the peices from both the original and donor engines mate up properly. So, with a case of beer, 2 days, a shop manual, some ziplock bags, a sharpie, and an assortment of tools, the digging began. Before you start the tear down, remove the spark plugs and pour a little oil in each cylinder. Let that sit at least over night. This will help loosen the pistons if necessary to help in removing the cylinders.

Of course, drain the oil first!! Then, with the shop manual, in hand begin the tear down. For a beginner, this was a fairly easy engine to tear down. The philips head bolts were kinda a pain. Using a hand impact driver i loosened most of them. I striped a couple :-\ . So, with a chissel and hammer i slowly got them to turn till they broke loose. Then Viola!! The cam cover is off :D

Now, the shop manual states that you require a special tool to slide out the rocker arm pivots ??? ... I used my finger and a sharpie to slide them out. If you are a beginner, remember to read over each section of the manual to ensure that you understand what you are doing before doing it. Also make sure that everything that comes off the top end of the engine is labeled according to cylinder. 1 to 4 from left to right as if you were sitting on the bike.

Once you are at this point, there is nothing holding the cam shaft and rocker brackets on. Simply tap them with a soft hammer until they pop off.

I am trying to not go into too much detail considering that you should have the manual in front of you. I am just trying to give some pointers in certain situations. Feel free to ask any questions.

Now loosen the nuts holding on the cylinder heads and remove them. I am not too concerned with the condition of the valve seats or the cylinder walls.

Now, the fun part... the cylinders. Hopefully, you let some oil sit in the cylinders to make sure they slide somewhat easily. Just wiggle the cylinders back and forth, without damaging the bolts. It will eventually come off. Then, remove the pistons by pulling the clip holding in the pivot. And again, using a sharpie, i pushed out the pivots. Keep track of which piston is which. I put them in labeled ziplock bags along with the pivot, rings, and clips. I will be replacing the rings and clips, but i like to be over cautious when doing something i have never done.

At this point you should have something like this sitting next to your lower end.

Now, it is time to seperate the two halves of the engine casing.

I then removed the internals and set them to the side. Then, with another case of beer, I repeated all these steps on the donor engine. And BAM!!! I have two completely disassembled engines.

Now is the moment of truth! Are the mating surfaces of the engine casing of the '70 compatible with the cylinders of the '74? YES!! THEY ARE ;D

Next, i am going to prep the cylinders, heads, and case for cleaning.
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